     :else (get-update-keys item)))
 
 (defn get-update-keys-ludo
-  "Return the update keys for a given item (see `get-update-keys`).
+  "Return the update keys for a given item (see [[get-update-keys]]).
   For the ludo catalog we need to group all other formats under the
   genre :bücher-über-spiel."
   [{fmt :format genre :genre :as item}]

    :else [fmt genre]))

(defn get-update-keys-neu-als-hörbuch
  "Return the update keys for a given item (see `get-update-keys`).
  For the neu-als-hörbuch all foreign language books need to ge
  grouped under `:bücher-in-fremdsprachen`, even kids books, so we
  need to group not only by `format`, `genre` and `sub-genre` but also

    :else [fmt genre]))

(defn get-update-keys-taktil
  "Return the update keys for a given item (see [[get-update-keys]]).
  For the taktil catalog we need to group the :taktilesbuch items by
  genre."
  [{fmt :format genre :genre :as item}]
